Suppose I have a post meta like "Region" it will contain values like "Region 1", "Region 2" etc. But it should only contain ONE value. Also I would like it to have an archive page. If I use custom taxonomy, users can select more than 1 value. Is it possible to have a drop down type selection instead?

curious, why is meta faster? why would this be a misuse of the taxonomy? i've done something similar and have been wondering whether to use tax or meta.
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helgathevikingJan 9 '12 at 16:36

@helgatheviking The query for taxonomies is rather complex: It asks three tables (terms, term_relationships and term_taxonomy) and is harder to optimize than the query for post meta which just asks posts and post_meta. But if your post meta contains serialized data it will be very slow of course. :)
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toscho♦Jan 9 '12 at 20:47